Improved GPS Settings app and GPS service (#222)

- Fixes and improvements to `GpsSettings` app, `GpsDevice` and `GpsService`
- Implemented location/GPS statusbar icon
- Added app icon
- Added support for other GPS models (based on Meshtastic code)

TactilityHeadless/Source/service/gps/Gps.cpp

@@ -1,3 +1,4 @@
+#include "Tactility/PubSub.h"
 #include "Tactility/service/ServiceManifest.h"
 #include "Tactility/service/ServiceRegistry.h"
 #include "Tactility/service/gps/GpsService.h"
@@ -14,7 +15,6 @@ static std::shared_ptr<GpsService> findGpsService() {
     return std::static_pointer_cast<GpsService>(service);
 }
 
-
 void addGpsDevice(const std::shared_ptr<GpsDevice>& device) {
     return findGpsService()->addGpsDevice(device);
 }
@@ -31,8 +31,20 @@ void stopReceiving() {
     findGpsService()->stopReceiving();
 }
 
-bool isReceiving() {
-    return findGpsService()->isReceiving();
+bool hasCoordinates() {
+    return findGpsService()->hasCoordinates();
+}
+
+bool getCoordinates(minmea_sentence_rmc& rmc) {
+    return findGpsService()->getCoordinates(rmc);
+}
+
+State getState() {
+    return findGpsService()->getState();
+}
+
+std::shared_ptr<PubSub> getStatePubsub() {
+    return findGpsService()->getStatePubsub();
 }
 
 } // namespace tt::service::gps